Direct current charging and discharging system and method capable of actively adjusting power

Abstract

The invention relates to a direct current charging and discharging system and method capable of actively adjusting power, and the system is characterized in that the system comprises an alternating current-direct current converter, a direct current bus and a direct current charging and discharging device, and the direct current charging and discharging device comprises a direct current-direct current converter and a control circuit; the alternating current-direct current converter is used for converting alternating current accessed by an alternating current power grid into direct current; the direct current-direct current converter is used for acquiring direct current bus voltage and energy storage capability parameters of the energy-storable equipment, and controlling charging or discharging of the energy-storable equipment according to PWM waves generated by the control circuit in a constant current control mode or a constant power control mode; the control circuit is used for determining instruction charging / discharging current or power and generating PWM waves according to the voltage of the direct-current bus, the energy storage capacity parameters of the energy storage equipment and the actual operation current or power of the energy storage equipment, and the direct-current micro-grid energy dispatching and operation control method can be widely applied to the field of direct-current micro-grid energy dispatching and operation control.

Description

technical field [0001] The invention relates to the technical field of DC microgrid energy scheduling and operation control, in particular to a DC charging and discharging system and method whose power can be actively adjusted. Background technique [0002] Due to the intermittent and random characteristics of power generation from renewable energy sources such as wind power and photovoltaics, the importance of power demand response has become increasingly prominent, which can provide a guarantee for the safe and stable operation of a zero-carbon power system in the future. At present, China has incorporated demand response into regional power planning, in order to maximize the flexible power regulation resources for user-side loads. [0003] A large number of loads on the user side have considerable energy storage capacity, which can support them for flexible electricity consumption, such as: electric vehicles or electric bicycles connected to charging piles and various con...

AI Technical Summary

Problems solved by technology

Based on this, a large number of existing technologies have proposed active power regulation control methods for loads in DC microgrids. However, a large number of energy storage devices in DC microgrids have not yet received sufficient attention. Power Active Adjustment Control Method

However, these methods often ignore the state differences of many energy storage devices in the DC microgrid, that is, the impact of their own energy storage capacity parameters on the participating demand response capabilities, such as: the current remaining power of the device, the command charge / discharge allowed by the device power etc.

Therefore, a large amount of energy storage capacity of this type of energy storage device has not yet been optimally dispatched, and the potential of flexible energy utilization on the user side needs to be further explored.

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